3 years ago

Physicochemical properties and prebiotic activities of polysaccharides from longan pulp based on different extraction techniques

Fei Huang, Huijun Liu, Ruifen Zhang, Lihong Dong, Lei Liu, Yongxuan Ma, Xuchao Jia, Guangjin Wang, Mingwei Zhang

Publication date: Available online 10 November 2018

Source: Carbohydrate Polymers

Author(s): Fei Huang, Huijun Liu, Ruifen Zhang, Lihong Dong, Lei Liu, Yongxuan Ma, Xuchao Jia, Guangjin Wang, Mingwei Zhang

Abstract

Longan pulp polysaccharides were extracted with hot water (LP-H), superfine grinding (LP-S) and superfine grinding-assisted enzymatic treatments (LP-SE). The yields, physicochemical properties and prebiotic activities of polysaccharides were investigated. Compared with LP-H and LP-S, the yield, sugar content, solubility, arabinose and mannose percentage of LP-SE increased while its apparent viscosity, particle size, Mw and glucose percentage declined. Three LPs contained similar glycosidic linkage of →3)-α-L-Araf-(1→, →3,6)-β-D-Galp-(1→ and α-L-Rhap(l→, while they each contained specific glycosidic linkage of →4)-β-D-Glcp(l→, →4)-β-D-Galp-(1→ and →5)-α-L-Araf-(1→ in LP-H, LP-S and LP-SE, respectively. Moreover, LP-SE exhibited stronger stimulation than LP-H and LP-S on the proliferation of Lactobacillus plantarum, Lactobacillus bulgaricus, Lactobacillus fermentum and Leuconostoc mesenteroides. The results indicated three extraction methods had some effect on chemical composition and structure of polysaccharide. LP-SE extracted by superfine grinding-assisted enzymatic treatment exhibited the highest prebiotic activities, which have a great potential in applying in functional food and medical industry.

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